Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing our new design;

FIG. 2 is a right side elevational view, the left side being a mirror image thereof;

FIG. 3 is a rear elevational view;

FIG. 4 is an enlarged scale top plan view;

FIG. 5 is an enlarged scale bottom plan view thereof; and

FIG. 6 is a reduced scale left side elevational view of the writing instrument with the cap deposed on the end remote from the writing point. 

The ornamental design for a writing instrument, as shown and described. 